Excavating apij a rat us



2 Shets-Sheet 1.

(No Model.)

I. P. LAMBING. EXGAVATING APPARATUS.

Patented Jun 7, 1892.

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ISAAC l. l'iitMlfllNti, OF GOLDEN, COLORADO.

EXCAVAT! hltli APPARATUS.

SPECIFIGATIGN forming part. of Letters Patent: N 0. 476,750, dated June7,1892- Application filetllliaroh 31, 1391. sm-iiiilto. 3871117.(Nomouuin.

To (z/ZZ whom it may concern: 7 lie it knownthat i, lSAAC l. LAMBING, ofGolden, in the county of Jeil'ersoi'l and State of Colorado, hhvoinvented a new and useful Improvement in ExcavatingApparnlus, of whichthe following is a full, cleaiyand exact description.

My invention consists in certain improvements, as hereinafter described,upon an eavator for which Letters Patent No. 403,762

were granted to me on May 21, 1889.

In the drawings forming part of this speciiication, in which likenumerals and letters indicate corresponding parts, Figure]. is averticaisect-ion, on thclineVit Viol Fig.3, of theoxcavatorandsteamoraircylinderbywhichits shovels are operated, with theshovels closed. l ig. .2 is a horizontal. cross-section on the line illVII of Fig. 1. is a top view of the excavator. Fin: :4 is a verticalcrossscctionf on the line IX iii. of Fig. 2,-showing one of the hingeswhich connects the shovels to the frame of the excavator. Fig. 5 isaside view, partly in section, of the hinge shown in'Fig. 4. Fig. 6 is avertica :ectienal representation of the excavator and steamer aircylinder by which its shovclsare operateddiitcring from Fig. 1 in thatthe shovels are open. Fig. 7 is a plan view of the series of links bywhich the upper end of the arm of each shovel. is connected with thecross-head at tho-end of the pistonrod, by which the shovels are openedand closed. Fig. 8 is a detached perspective representation of one ofthe shovels of the excavator. Fig. 9 is a cross-scctien through theshovel on the line XIV Xiiof Fig. 8, show ing' the shape of the shoveland the mode of attacl'iing the cutters. Fig. 10 is a front view of theshoe which forms the lower extremity of the shovel. v

The excavating portion consists of a numher (say six.) ofsectionsforming, when opened, pointed segmental shovels 2'7, each having aconcave back of the shape shown in Figs. 8-

and 9, and when closed forminga heinispheri cal bucket G. (See Fig. Ii.)Each segmental shovel has an inwardly-bentlover-arm 28 rigidly attachedto or made in one with it, and. at. the top oi the shovel and at thebase of its arm it is jonrnalcd to log 2!), depending from and formed inone piece with a ring 80 at the bottom of the cone-shaped cover orskirtsquare key which is held in place by ajain-.

nut,asshownin Fig.9. 'l-hebottornofthcconeshaped cover 30 of theexcavator-bucket is riveted to the ring; 30, as shown in Fig. Land itsupper end is riveted to the base-plate or head ofa cylinder H, which hasa piston 34 and a'piston-rod 35, which passes down into the 30 Whichforms the upper. part of the exca- The skirt 30 should be made cone 30'of the bucket througba stuifing box.

It is very important that this ring 30 should be very strong and theconnections of the shovels to the ring very secure, as a. very greatstrain comes on this part both when the shovels are forcibly closedafter they have entered the ground and when raised up with the n'iass ofearth, stones, &c., contained therein. I therefore use a ring having aflat horizontal baseportion, an integral annular flange rising from thesame and inclined inwardly, and a series of lugs depending from thelower side of the base portion, the whole constituting a solid steelcasting.

The cylinder II has ports 30 37-one ateach end-for the admission andexhaust of steam or compressed air, seas to operate the piston, suchadmission and exhaust of steam or cornpressed air being effected througha flexible pipe 38, leading to a suitable steam or compressed-airsupply. Attached to the lower end of the piston 35 and within the cone30' is a cross-head 39, (see Figs. 1 and 7,) to which the upperextremity'ot' each shovel 27 is connected by a link 40, the connectionswith the links;.bcir1g made by staple-shaped straps passing through thelinks and secured by nuts. \Vhen, therefore, the piston-rod 35 is-depressed, it draws the level-arms 28 downward and inward, causingv thepointed segmental shovels 27 to open and assume the position shown inFig. (5. These shovels are pivoted by the journals 31, situate at thetop of the shovels on a line with the base of the leverarms 28. \Vhenclosed they fit snugly together. These shovels have an inward cuirvaturein the line XIV XIV of Fig". 8, as is more clearly shownin Fig. 9, wherethe upper line represents the curvature of the outside of the shovel.This inward curvature is important, as it greatly facilitates theinsertion and withd rawal of the shovel into and from the gron n d, thusenabling the shovels to be used in hard material, as the concave portionof the outer edge of the shovel does away with the friction incident tothe use of the old or convex form. Theouteredgcsof the shovels may becomposed of cutter-plates 41, of hard ste'ehremovably attached by rivets(see Figs. Sand 9) to the shovels, so that they maybe replaced if brokenor sharpened when they get dull by use. The toe 42 may be in one piece,as shown in Fig. 10. When the piston rod 35 is raised, it raises thecross-head 39, and, raising the leverarms 28, it causes' the shovels toassume the position shown in Fig.1, closing the bucket.

When the excavator is lowered, the shovelsare opened, as. in Fig. 6,with their toes point- "the shovels, raising up the mass and inclosingit as 'in a basket. The excavator is then raised to a suflicient height,and, the boom' [being turned untiltheload'ed excavator comes I, over theplacewhere it is to deposit its burlever-arms 2S and causing the shovelsto as:

den, the excavator is opened by depressing the piston of the cylinder,thus lowering the sutnethe position shown in Fig. .6, thus opening thebucket and'discharging the load. I I claim 1. In an excavator, thecombination, with an airorsteam cylinder,piston,and piston-rod,

and segmental shovels having arms directed inward and upward to a pointabove their attachment to -thecross-head or piston-rod, of astrongmetallic ring having depending lugs to which the lever-arms of theshovels arc pivoted, said ring being connected with the piston-cylinder,substantially as and for the purposes described.

2. In. an excavator, the combination of a steam or air cylinder, piston,and piston-rod, a frame for supporti n g the excavating shovels,consisting of a metallic skirt attached to the lower end of thecylinder, a ring at the base of the skirt, lugs attached to anddepending from said ring, and segmental shovels pivoted to said lugs andhaving inwardly-bent leverarins connected with the piston-rod,substantially as and for the purposes described.

3. In an excavator, the combination of a series of pointed segmentalshovels, each having an inward curvature across or in a horizontal planeand an outward longitudinal curvature, with a ring or frame, to whichthey are pivotally connected, and arms connected with the piston-rod ofan engine placed above the ring or frame which supports the shovels,substantially as and for the purposes de scribed.

at. In an excavator, the combination, with a base-ring having an 'upperintegral flange.

and depending lugs, of a cover secured to the upper flange, shovelspivot-ed in the lugs, and means for operating said shovels,substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 14th day ofMarch,A. D. 1891.

. ISAAC P. LAMBING.

Witnesses: 1

W. B. Conwm, O. B. PAINE.

